80LS1T Posted February 15, 2008 Share Posted February 15, 2008 Well I've started to rewire my car and I've hit a small snag. I am trying to figure out the headlight switch wiring but I'm unsure as to how the factory had it wired through the relay. On the switch side of the relay there is a "D" labled on one side(the normally open side) and the other side it is labled "M"(normally closed side). Basically the factory was using the 87 and 87a pins of a normal relay. I just want to know what the D and M stand for? I have a factory service manual but either its not in there or I can't find it. So 280ZX gurus shed some "light" on this for me! LOL sorry bad joke! Guy Quote Link to comment Share on other sites More sharing options...
Warren Posted February 15, 2008 Share Posted February 15, 2008 Don't know about a D or an M on the relay, but this might help. From the 82 FSM: Or am I out in left field AGAIN? Quote Link to comment Share on other sites More sharing options...
jeffp Posted February 15, 2008 Share Posted February 15, 2008 I just completed a relay and wiring upgrade on my zx. Nissan is switching out the power ground to the lamps. The switch in the car is switching the B+ or 12 volts to the lamps. Now, also they have the head lamp test circuit for the dash indicator. The thing that is different is the high low bean switch in the car. I thought they were switching from 0 to 12 volts with the high beam switch, but they start out with 12 volts to the high bean switch, and when you select high beam, the switch line goes to 0 Well for a relay, that would be hooked up so that the relay was energized in low bean and off in high beam. So for the majority of the time the relay is switched on because we drive most on low beam. I ended up bypassing the lamp test circuit to get the indicator to go off when you run the test from the dash. This is an easy fix, but you will need two relays per light, one for the ground switch and one for the NEW 12 load switch. Use the wires to the light to toggle the new power and ground feed relays. This takes all of the strain off of the stock wire harness and switch. Also check the fuse link in the box, to make sure the connectors in the fuse link box are still good. My car over heated the connector and the lights got dimmer. Use the FSM to determine the correct wires, and the two letters you mentioned I don't know about, but the side of the relay should have some sort of diagram that have the letter and pin location. Hope that helps. Quote Link to comment Share on other sites More sharing options...
80LS1T Posted February 16, 2008 Author Share Posted February 16, 2008 Warren I think that explains it. My pic is the same as yours just lable different. I am not using any of the stock wiring in my car except for a few connectors going to things like the mirrors, p/w, heater control, etc. I don't have stock headlights but I was just wondering how they had it wired up. I think I have it figured out now! Thanks guys! Guy Quote Link to comment Share on other sites More sharing options...
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